Altaba is a closed-end investment management company whose assets include investments in China's Alibaba (Ticker: BABA), Yahoo Japan and other cash and marketable securities. The company is a successor to Yahoo, which got sold to Verizon. Altaba had $54 billion in assets as of year-end 2016, of which the Alibaba stake accounted for 62% of the total, the Yahoo Japan stake 14% and the rest was cash and marketable securities.